Lawn mower sharpener



June 12, 1945. Q BROOKS LAWN MOWER SHARPENER 2 Sheets-Sheet 1 Filed May 31, 1944 Jn-u'cnfo't, OAKLEY BROOKS June 12, Q. R O S LAWN MOWER SHARPENER Filed May 31, 1944 2 Sheets-Sheet 2 4 OAKLEY BROOKS Patented June 12, 1945 UNITED STATES IPATENTJOFFICE' LAWN MOWER SHARPENER Oakley Brooks, Columbus, Ohio Application May 31, 1944, Serial No. 538,117 1 Claim. (e1. 76-821) This invention relates to improvements in a lawn mower blade sharpening device, and has for its object to provide a very simple, inexpensive and effective tool whereby lawn mower blades may be rapidly sharpened.

Another object of the invention is to provide a two-end handle upon which a file carrier is adjustably mounted.

A further object of the invention is to provide a lawn mower bladesharpener device comprising a file holding means, a handle device upon which said file holder is adjustably mounted, a roller bearing for said handle member for operating upon a lawn mower frame rod.

With the above and such other objects in view, as. may hereinafter more fully appear, I have invented the device shown in the accompanying drawings in which:

Figure 1 is a cross sectional view of a lawn mower illustrating my invention attached to one of its blades. v

Figure 2 is an enlarged view of my device detached from the lawn mower.

Figure 3 is a top plan view of the invention.

Figure 4 is a section on line 44 of Figure 2.

Figure 5 is a bottom plan view of Figure 2.x

Figure 6 is a section on line 66 of Figure 3.

Figure 7 is a section on line 'I'l of Figure 5.

Figure 8 is a side elevation of a file holder shown partly in section.

Figure 9 is a bottom plan view of Figure 8.

Figure 10 is a perspective view of a finishin file; and

Figure 11 is a perspective view of the file holder.

Like reference characters indicate like parts, throughout the following specification, and in the several views in the drawings in which I indicates my invention which comprises an elon-v gated frame member 2 having handle ends 3 and 4. Slidably mounted on the member 2 is a file holder 5 and which is provided with a thumb screw 6 for securing the holder in fixed position. The member 2 is provided with a U-shaped upstanding projection l the side arms 8 and 9 of which are provided with a series of aligning bores 10 and II to receive a bolt l2 upon which is mounted a roller 13.

This roller bearing member is adjustable up or received.

down according to the size of the blade'to be sharpened, and the roller l3 bears upon a bar I4 which forms a part of the frame of the lawn mower proper.

The file holder or carrier 5 consists of a recv tangular block l5 with a longitudinal passage [6 therethrough of a depth sufi'icient to-take the frame member 2 and a file I! which is slipped into position after the member 5 is placed upon said frame member. The elongated end 2' of the member 2 is provided with a scale I 8 whereby the carrier maybe properly placed relative to the blade IQ of the lawn mower 20 being sharpened and the rod I 4.

The lower wall 'of the member 5 is supported centrally by a channel 2| forming two sections 22 and 23 the inner ends 24 and 25 of which are curved downwardly the terminals 26 and 21 of which engage the opposing sides of the blade IS, the cutting edge 28 of which projects upwardly against the cutting surface 29 of the file I'I. ,This

arrangement will permit the block IE to. slide freely backward and forward upon said blade.

After the blade has been roughly sharpened, the filev I1 is removed and a finishing file block 30 is placed in the file carrier, the markers 3| thereon aligning with the markers 32 on the surface 33 of said file carrier. This latter file is operated upon the blade several times until a nice finishing edgehas been obtained.

I claim:

A lawn mower bladesharpening device comprising a block having a. passage way longitudinally therethrough and having a transverse opening across its bottom for receiving alblade to be sharpened, a frame member disposed through the block, a file disposed through the block and 7 against the bottom side of the frame member, detent means on the" block for holding the memher and file intact and against relative movement with respect to each other, said frame member be j OAKLEY BROOKS.

of a lawn mower may be 

